* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #000000;
  --bg-secondary: #101010;
  --bg-card: #1a1a1a;
  --border-color: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #888888;
  --text-muted: #555555;
  --accent: #0095f6;
  --accent-gradient: linear-gradient(135deg, #833ab4, #fd1d1d, #fcb045);
  --like-active: #ff3b5c;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
}

body {
  font-family: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
}

.header-content {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  font-size: 28px;
  animation: spin 10s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.logo-text {
  font-size: 24px;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

/* Main */
.main {
  flex: 1;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
}

/* Post Form */
.post-form {
  display: flex;
  gap: 12px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  animation: fadeSlideIn 0.3s ease;
}

.form-avatar {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  background: var(--bg-secondary);
  border-radius: 50%;
  flex-shrink: 0;
}

.form-inputs {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-name {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: var(--transition);
}

.input-name:focus {
  outline: none;
  border-color: var(--accent);
}

.input-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text-primary);
  font-size: 16px;
  font-family: inherit;
  resize: none;
  transition: var(--transition);
}

.input-content:focus {
  outline: none;
  border-color: var(--accent);
}

.input-content::placeholder,
.input-name::placeholder {
  color: var(--text-muted);
}

.btn-post {
  align-self: flex-end;
  padding: 10px 24px;
  background: var(--accent-gradient);
  border: none;
  border-radius: 20px;
  color: white;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}

.btn-post:hover:not(:disabled) {
  transform: scale(1.02);
  box-shadow: 0 4px 20px rgba(131, 58, 180, 0.4);
}

.btn-post:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Feed */
.feed {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Post Card */
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  animation: fadeSlideIn 0.4s ease;
  transition: var(--transition);
}

.post-card:hover {
  border-color: #3a3a3a;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.post-avatar {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--bg-secondary);
  border-radius: 50%;
}

.post-meta {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-author {
  font-weight: 600;
  font-size: 15px;
}

.post-time {
  font-size: 13px;
  color: var(--text-secondary);
}

.btn-delete {
  background: none;
  border: none;
  font-size: 16px;
  cursor: pointer;
  opacity: 0.4;
  transition: var(--transition);
  padding: 8px;
}

.btn-delete:hover {
  opacity: 1;
  transform: scale(1.1);
}

.post-content {
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 16px;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Actions */
.post-actions {
  display: flex;
  gap: 24px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.btn-action {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  padding: 8px 0;
  transition: var(--transition);
  font-family: inherit;
}

.btn-action:hover {
  color: var(--text-primary);
}

.action-icon {
  font-size: 18px;
  transition: var(--transition);
}

.btn-like.liked {
  color: var(--like-active);
}

.btn-like.pop .action-icon {
  animation: popLike 0.3s ease;
}

@keyframes popLike {
  0% { transform: scale(1); }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); }
}

.btn-comments.active {
  color: var(--accent);
}

/* Comments Section */
.comments-section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  animation: fadeSlideIn 0.3s ease;
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.comment {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  animation: fadeSlideIn 0.3s ease;
}

.comment-avatar {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  background: var(--bg-card);
  border-radius: 50%;
  flex-shrink: 0;
}

.comment-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.comment-author {
  font-weight: 600;
  font-size: 13px;
}

.comment-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.btn-delete-comment {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  transition: var(--transition);
  padding: 4px 8px;
}

.comment:hover .btn-delete-comment {
  opacity: 0.6;
}

.btn-delete-comment:hover {
  opacity: 1 !important;
  color: var(--like-active);
}

/* Comment Form */
.comment-form {
  display: flex;
  align-items: center;
  gap: 10px;
}

.comment-form-avatar {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  background: var(--bg-secondary);
  border-radius: 50%;
  flex-shrink: 0;
}

.comment-input-name {
  width: 100px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
}

.comment-input-text {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
}

.comment-input-name:focus,
.comment-input-text:focus {
  outline: none;
  border-color: var(--accent);
}

.comment-input-name::placeholder,
.comment-input-text::placeholder {
  color: var(--text-muted);
}

.btn-comment {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-comment:hover:not(:disabled) {
  transform: scale(1.1);
  background: #00a0ff;
}

.btn-comment:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  animation: fadeSlideIn 0.4s ease;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: 16px;
  animation: bounce 2s ease infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.empty-state h3 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 15px;
}

/* Footer */
.footer {
  padding: 24px;
  text-align: center;
  border-top: 1px solid var(--border-color);
  margin-top: 40px;
}

.footer a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition);
}

.footer a:hover {
  color: var(--accent);
}

/* Responsive */
@media (max-width: 640px) {
  .main {
    padding: 16px;
  }
  
  .post-form {
    padding: 16px;
  }
  
  .form-avatar {
    width: 40px;
    height: 40px;
    font-size: 22px;
  }
  
  .post-card {
    padding: 16px;
  }
  
  .post-avatar {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }
  
  .comment-form {
    flex-wrap: wrap;
  }
  
  .comment-input-name {
    width: calc(100% - 52px);
    order: 1;
  }
  
  .comment-form-avatar {
    order: 0;
  }
  
  .comment-input-text {
    width: 100%;
    order: 2;
  }
  
  .btn-comment {
    order: 3;
    margin-left: auto;
    margin-top: 8px;
  }
}